Are there any developers tools you would like to see with React, Angular or Vue?

Hi all,

A few schoolmates and I are looking to build an open source developer tool in order to help current engineers who are working with some of the popular front end technologies, such as React, Angular and Vue. We have seen a few prototyping tools for React and Vue and we also came across Bit Dev for React - would angular or vue developers like a tool like Bit Dev? We are looking to build something impactful and meaningful to the community and would really like your opinion on any developers tools that you would like to see.